Sawing machine



Oct. 5, 1937. A. LGWENSTEIN ET AL.

SAWING MACHINE Filed Nov. 9, 1935 n wxwN \M 1m 8% MNMMM w, m QM W i: 2155:; M w N dm\ vx 0W 8 Patented Oct. 5, 1937 UNITED STATES PATENT OFFICE SAWING MACHINE Alfons Lilwenstein and'Fritz Hellinger, Berlin, Germany; said Hellinger assignor to said Liiwenstein 2 Claims.

Our invention relates to sawing machines and more particularly to high speed sawing machines. It is an object of our invention to provide an improved sawing machine adapted for sawing materials of any kind such as metal, wood, cork,

leather, synthetic materials, etc.

. In sawing machines known in the art the saw blade is held by means of movable holders the upper one of which is guided in a guiding member arranged at the free end of a bent support secured to the working table. Machines of this kind when operated at a high speed involve the drawback that the guiding member of the upper holder carries out oscillations up and down along a circular are thereby imparting to the saw blade tilting movements so that alternatively at every stroke only the upper or lower portion of the blade is in cutting contact with the piece of work. In consequence thereof an additional guide for the blade must be arranged close to the upper surface of the piece of work. Besides this the vertical column of the bent support troubles the operator, for instance, in rotating an oblong piece of work.

It is an object of our invention to provide a sawing machine in which these drawbacks are avoided.

It is a further object of our invention to provide a high speed sawing machine of a simple and cheap construction.

A sawing machine according to our invention is particularly useful for sawing patterns such as dial plates from metal sheets, wood, artificial resin, bone, nacre, ivory or the like. It may be used, if desired, for sawing other materials such as fabric, cloth, leather, cork, rubber sponge, felt,

etc.

In a sawing machine according to our invention a bridge-like oblong member is supported on the table at opposite sides of the saw blade, said member carrying the guide of the upper holder of the blade, a spring being provided the ends of which abut on said member and the upper free end of the upper holder, respectively. In this manner a tilting movement of the blade in its cutting plane is avoided, the forces tending to cause tilting oscillations of the blades compensating each other due to the arrangement of the guide of the upper holder on the bridge-like member supported on opposite sides of the blade. Thus the blade may carry out only vertical oscillations in its longitudinal direction, which are not disadvantageous but, on the contrary, improve the effect of the spring.

In the drawing affixed to this specification and 55 forming part thereof some embodiments of our a sawing machine according to our invention. 5

Fig. 2 is a plan view of the machine shown in Fig. l.

Fig. 3 is an end elevation of the machine shown in Fig. 1 taken in the direction of the arrow A.

Fig. 4 is an elevation, partly in section, of a 10 member forming part of the machine shown in Fig. 1.

Figs. 5 and 5a are a front and a side elevation, respectively, of another member forming part of the machine shown in Fig. 1. v 15 Referring now to the drawing", I is the working table provided with a plate 3, preferably of circular shape. The plate 3 is provided with a slot 2- or the like through which the saw blade extends. Below the plate 3 the driving motor 4 is arranged 20 which imparts a reciprocating motion to the lower ram or holder 5. The upper portion of the holder 5 is hollow and carries an intermediate member 6 provided in its upper portion with a recess for the reception of a clamping member 1 to 25 which the lower end of the blade 8 is secured by means of a screw 1a or the like. The upper end of the blade 8 is held in similar manner by an upper clamping member 9 carried by the upper holder l0, transverse to an oblong bar ll remov-- 30 ably secured at its ends to supports l2 secured to the table I by means of screws lZa or the like.

I3 is a sleeve secured to the bar II for instance by means of screws l3a, said sleeve forming a guide for the holder l0. I4 is a helical spring 35 surrounding the upper portion of the holder Ill and abutting with its lower end on the bar II and with its upper end on a nut l5 screwed on the threaded upper end of the holder II]. If desired, a washer l5a may be inserted between the nut I5 40 and the upper end of the spring I4. I 6 is a counter-nut securing the nut l5in position. The tension of the spring I4 may be adjusted by adjusting the nut l5. In order to protect the blade 8 against torsion the holder I0 is secured against 5 rotation by suitable means such as a groove I'I provided in the holder I0 and a stationary pin l8 engaging said groove. Similar means (not shown) may be provided in connection .with the holder 5.

Due to the fact that the bar II is detachably secured to the supports I! the distance between the sleeve l3 and the table [may easily be inincreased by rotating the bar H about its longitudinal axis by 180 so that the sleeve l3 will screw II to a slide 2. (Figs. 1, 2 and 4), which may be shifted along the bar II and secured in position by means of a screw 22.

In order to facilitate the cutting of circular articles from the piece of work, a suitably bent armllissecuredtoasliderllshapedinsimilar manner as the'slider 2., the lower end 284 of thearmn beingpointedsoas tosecurebymeans of it in position the centre of the circular article to be cut. In order to facilitate the adjusting of the diameter of the article, the upper surface of the bar II is provided witha scale 25 along which the slide "24 may be shifted.

The operation of this device is as follows:

Apieceofworkisputontheplatei. na

circular portion is to be cut from the piece of work, the arm 23 is set was to engage with its pointed end Ilathe piece of work at the centre of the circular portion to be cut. Then the motor 4 is started which drives the holder 5 and the blade 0 which will carry out a reciprocating movement in vertical direction. Due to the guiding of the upper holder II by means of the sleeve lisecuredtothebarllthebladelwlll reciprocate even at a high speed in an exac vertical direction without tilting.

Wewishittobeunderstoodthatwedonot desire to be limited to the exact details of construction shown and described for obvious modiilcations will occur to a person skilled in the art. In the claims aflixed to this specification no selection of any particular modification of the invention is intended to the exclusion of other modifications thereof and the right to subsequently make claim to-any modification not covered by these claims is expressly reserved.

We claim:

1.Ina;Jig sawmachlne,upperand lower chucks mounted to support a blade for rectilinear, reciprocating movement, an upper plunger sup-' porting said upper chuck,'and means for supporting said upper plunger, chuck and blade against lateral and edgewise deflection on the down stroke thereof, said means comprising a saw table, standards mounted on said saw table, a rigid bar extending across said table and supported by said standards, said plunger and chuck being mounted on said arm intermediate said standards.

2. A device, as claimed in claim 1 in which said standards and rigid bar are removably connected to said table and to each other. 7

- ALFONS rbwmss'rlmw.

FRI'IZ HEILINGER. 

